It can be difficult to become better in your partner's native language, especially if you are both living in your home country, with your partner being fluent in your native language, while you are still struggling to learn theirs. I know this from experience in my day-to-day life, living in Germany together with my Japanese partner.

Here are some tips for how to speak more in their native language with them (that I am trying my best to implement myself).

Meet together with their friends that have the same native language.
Visit their home country and family together.
Read and listen to material in the target language. So you can start thinking in that language. Then you become also more comfortable speaking it. You can also speak to yourself in that language.
Watch a movie or show in their language together. Subtitles can help with understanding if it is still too difficult to follow otherwise.
Get used to speaking the language with an online teacher. (You can try using italki or other platforms.)
Find more friends speaking the target language. You can look for a tandem partner or visit language exchange events in your neighborhood.
Become less afraid of making mistakes by getting used to them. They are a natural part of the learning process. It is better if your partner does not correct your small errors so you become more comfortable speaking. (However, correcting major errors or wrong words can avoid misunderstandings with others in the future.)
You can also mix the two languages if it helps you communicate or get used to it. If you don't know a word, use your native language. You can then ask your partner for the translation or how to naturally express something. You can also use your native language and sprinkle in words of their language. Nothing is forbidden!
When they start a conversation in their language, try to answer in it. It can be a good opportunity and they are trying to help!

9 Tips on How to Speak More in Your Partner's Native Language

It can be challenging to become better in your partner's native language, especially if you are both living in your home country, with your partner being fluent in your native language.

The all-in-one writing platform.

Write, publish everywhere, see what works, and become a better writer - all in one place.